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IAUC 4156: 1982i; 1985l

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IAUC number 

                                                  Circular No. 4156
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM    Telephone 617-495-7244/7440/7444


PERIODIC COMET HALLEY (1982i)
     D. K. Yeomans, Jet Propulsion Laboratory, provides IHW Astrometry
Network orbit number 33, based on 4036 observations from 1835
to 1985 Dec. 17 (rms residual 1"706), with nongravitational
parameters A1 = +0.09 and A2 = +0.0155:

         T = 1986 Feb. 9.45862 ET    Epoch 1986 Feb. 19.0 ET
     Peri. = 111.84652                    e =   0.9672750
     Node  =  58.14341   1950.0           a =  17.94045 AU
     Incl. = 162.23921                    n =   0.01297042
         q =   0.5871013 AU               P =  75.99 years

     1985/86 ET  R.A. (1950.0) Decl.      p        r       m1

     Dec. 31    22 17.48    - 2 18.4
     Jan.  2    22 12.63    - 2 47.6    1.179    0.992     4.3
           4    22 08.09    - 3 14.8
           6    22 03.81    - 3 40.5    1.254    0.931     4.2
           8    21 59.75    - 4 04.8
          10    21 55.85    - 4 28.1    1.324    0.872     4.0
          12    21 52.10    - 4 50.5
          14    21 48.45    - 5 12.4    1.388    0.815     3.8
          16    21 44.87    - 5 33.9
          18    21 41.35    - 5 55.3    1.445    0.760     3.6
          20    21 37.86    - 6 16.8
          22    21 34.37    - 6 38.5    1.492    0.711     3.4
          24    21 30.88    - 7 00.5
          26    21 27.36    - 7 23.1    1.529    0.667     3.2

     G. Emerson, Boulder, CO, reports that a photograph taken with
his 0.30-m f/1.8 Schmidt telescope on Dec. 30.08 UT shows a dust
tail and a gas tail, each > 2 deg long, separating 0.5 deg from the head.

     Further total visual magnitude estimates: Dec. 22.02 UT, 4.8
(J. E. Bortle, Stormville, NY, 10x50 binoculars); 24.94, 4.5 (D. W.
E. Green, Lindenhurst, NY, 20x80 binoculars); 26.00, 4.7 (Bortle);
26.93, 4.1 (Green, Cambridge, MA, 7x50 binoculars); 27.99, 4.7
(Bortle); 28.99, 4.7 (Bortle); 29.95, 4.3 (Green).


COMET HARTLEY-GOOD (1985l)
     Bortle also reports his total visual magnitude estimates of
this comet with 20x80 binoculars:  Dec. 19.44 UT, 7.8; 20.45, 7.9.


1985 December 30               (4156)            Daniel W. E. Green

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